Steam generator



Feb. 9, 1932. s. CHADIWICK ET AL STEAM GENERATOR Original Fileg g gl 13. 1927 4 Sheets-Sheet 1 o 3 c i 3 @ga 3 c 3@ c 3@; @C

Feb. 9, 1932. I s, CHADWICK ET AL 1,843,914

STEAM GENERATOR Original Filed April 15, 1927 4 Sheets-Sheet 2 tli M Feb. 9, 1932.

L s. CHADWICK ET AL 1,843,914

STEAM GENERATOR Original Filed April 15 9 4 Sheets-Sheet 5 Feb 1932. L. s cHADwlcK ET AL 1,843,914

STEAM GENERATOR Original Filed April 15, 1927 4 Sheets-Sheet 4 /gill A 7.

VIlI/IIIIII/I/l/I/I I'll/11 Patented Feb. 9, 1932 I ETD STATES AT NT IC LEE S. CI-IADWICK, OF SHAKER HEIGHTS VILLAGE' AND MARC RESEK, OF CLEVELAND HEIGHTS, OHIO, ASSIGNORS TO PERFECT A CORPORATION 7 OF OHIO J ION STOVE COMPANY, OF CLEVELAND, OHIO,

STEAM- GENERATOR Original application filed. Apri1'13, 1927, Serial No.- 183,411;

Dividedand this application filed J'une 19,

' 1929; Serial No. 372,052.

This invention pertains to an improved steam generator that is especially adapted for use with fuel oil burning apparatus of the class shown in an application filed by us on April 13, 1927, and bearing Serial No. 183,411, the present case being a division thereof.

The apparatus that is completely disclosed in the parent application involves steam operated atomizing burners that are suitably supplied with fuel oil, and a steam generator or boiler that is subjected to the heat of the burner flames and from which generator or boiler the burners receive thelr steam supply,-

together with certain appurtenances which go to make up a practical and satisfactory oil burner that is substantially automatic in its operation. While oil burning apparatus of the class referred to aresusceptible to a very wide range of utility, they are intended for use more especially in the firing of hot air, hot water and steam furnaces in homes and other buildings and with no territorial restrictions. They maybe 'used wherever oil and water are available. Y

The formationof scale in the boilers or generators of apparatus of the class in question has been the source of considerable annoyance and trouble and is made necessary the use of watersoftening compounds and water strainers or filtering means and all without a very marked degree of success. 1 v The presentapplication is restricted'to the novel steam generator incorporated in the apparatus disclosed in the parent case, and the primary object of the invention, as, pertains to said generator, is to provide a generator of such nature that the oil burning apparatus wherein it is incorporated is adaptedfor ing and priming, and any sediment that is precipitated in the generator'will be concentrated in'the bottomjportion thereof where it willnot impede thetransmission of heat .to thewater nor be carried off, to any appreciable degree, with the steam. Furthermore, because of the fact that the lower portion of the bottom wall ofthe generator is not subjected to intense'or direct heat, the sediment doesnot form into'a scale and bake on the bottom wall, but'merely settles thereon in the form of a thick loose mud that is readily removable. i r

' It is a further object of our invention to in-y crease the transmission of heat to the water in generators of the character referred to,-and to the attainment of this, we provide a series of pins which depend from the top of the generator and project into the water, and these pins are preferably made smooth and tapering so that any scale which formson them will crack and drop off by reason of the expansion and contraction of the pins resulting from the alternate heating and cooling of the generator through the customary use of the apparatus. Also,the'presence ofthese pins prevents undue heating of the top of the generator inasmuch as they carry the heat sirably located directlyabove and constitute, 'in'effect, continuation of the. beforementioned pins. I An embodiment which the foregoing objects are realized is illustrated'in the accompanying drawings wherein Fig. 1 is a plan view of the steam generator as it would appear with the refractory walls of the combustion chamber of the apparatus removed; Fig. 2 is a cenof the invention through tral longitudinal section through the generator and parts associated with it, as indicated by the line 22- of Fig. '1', the walls of the combustion chamber being included in: the

present view; Fig.6 is asectional front elevation of the generator, the plane of section being indicated by the line '33.of Fig. 2; and

Fig. 4 is a vertical transverse section through the generator, on the line 4-4 of Fig. 2 and looking forwardly, as indicated by the arrows associated with said line, one side of the combustion chamber being omitted for clearness.

The apparatus comprises generally a stand 1 on which is mounted the steam generator, and superimposed upon the generator is a housing, designated generally by the reference numeral 2, preferably of suitable refractory material, that encloses a main combustion chamber 3 and an auxiliarycombustion chamber 4-. Burners of the injector type are arranged to discharge their products into the housing, the central burner of the apparatus being shown in Fig. 2 anddesignated 5, and a damper 6 that is movably sustained at a point of. communication between the two combustion chambers, determines by its position what proportion, if any, of the products of combustion shall pass through the auxiliary combustion chamber a. It may be explained that the bottom wall of the auxiliary combustion chamber is constituted of the top wall of the steam generator and, as hereinbefore stated, pins depend from the top wall of the generator into the water for conducting heat from the former tothe latter, and spuds rise from said wall and intercept the passage of the products through the auxiliary combustion chamber and consequently abstract therefrom heat that would otherwise escape.

Conduits are suitably arranged to conduct steam from the generator tov the burners, as will hereinafter more fully appear, and as may be seen by reference to the parent application, those leading to the auxiliary burners include valves that are controlled by pressure actuated means that are subjected to thesteam pressure within the generator. Gil is supplied tothe burners from a suitable source (not shown).

When the damper 6is in a position to divert the products of combustion through the main combustion, chamber 3, it thus protects the steam generator from the heat of said products. A. weight tends to move the damper from generator shielding position, andpressure operated means that is subjected to the steampressure in the generator acts to. move the damper in opposition to said weight so that as the steam pressure rises within the generator, the damper is moved {toward a position wherein it shields the generator from the intense heat of the burner flame. This pressure operated means constitutes no part of the present invention and is therefore not illustrated, though a full 4 understanding of it may be had from the application above identified and whereof this case is a division. i

It may be mentioned in passing" thatithe complete oilburning apparatus, which is in the nature of a-self-contained unitary structure, is of a size and design adapted to be conveniently located in front of a furnace in a position to discharge its products into the firebox thereof.

The steam generator, designated generally by the reference numeral 10, surmounts the stand 1 and is secured thereto by screws 11. The generator is made-up of a lower pan-like section 12' and an upper section 18. The upper section 13- is formed: with elevated portions along each of its sides, the same constituting steam domes that are designated 14; and the top wall 15 of the generator extends inwardly and downwardly from the inner walls 16 of the steam domes. The sections 12 and 13 have peripheral flanges 17 that are clamped together, with a gasket 18 of suitable packing material compressed between them, by bolts 19.

By forming the generator sections 12 and 13 with mating necks 12a and 13a respectively, a flue 21 is provided through the generator for the passage of products of combustion from a starting burner, shown generally at 22 in Figs. 3 and 4:. Thenecks 12a and 13a are secured together, with a washer 23 compressed between them, by screws 24. The lower section 12 is providedv with a clean-out opening 25 in its front wall that is closed by acover 26 to which a; yoke 27 is attached; and screws 28 are engaged through the notched ends of the yoke 27 and are threaded into the front wall of the generator section 12 forholding. the cover in place. A drain is alsoprovided for the generator which, in the present instance, is formed of a pipe 29 that is tapped into the right hand side of the section12. adjacent its forward end.. The outer end of the pipe29 is closed by a suit able plug. (not shown). The top wall 15=of the generator is provided witha multitude of frusto conical bosses 30 which terminate at their upper ends in heat abstracting spuds 31. Screwed upwardly into tappedholes that are formed in the bosses 30 011 the underside of the top wall 15-are pins These pins are preferably made smooth and tapering, as

hereinbefore explained, so that by reason of their expansion and contraction due to the alternate heating and cooling of' the generator through the customary use of the apparatus, any scale which forms upon the pins will crack and drop off. The? pins 33, because of their relation to the spuds 31, constitute, in efiect, continuations thereof.

Disposed like an arch across the front end of the generator 10 is asteam box that is rectangular in plan andhas depending legs 36 at its opposite endswhose lower ends overlap the upper front corners of the steam domes 14. The steam box is securedto the generator by screws 38 that pass through apertures in lugs 39 that are formed on the lower ends of the legs 36 and are screwed into the adjacent portion of the generator,

and by screws 40 that are extended entirely through the legs 36 and have their rear ends threaded into tapped apertures in lugs 41 which rise from the forward ends of the steam domes 14.

Oil is supplied from a suitable source (not shown) through a pipe to the oil jet of each of the burners, the oil supply pipe of the burner 5, shown in Fig. 2, being designated Steam is conducted from the steam dome 35 through tubes 44 to the steam nozzles of the burners. The mixture of oil and steam from the burners is directed into the combustion chamber through tubes 46 of refractory material, the tube associated with the central burner being inclined downwardly and inwardly so as to discharge the products of combustion from its respective burner more directly into the auxiliary combustion chamber 4 when the damper 6 is swung downwardly through the pressure device hereinbefore referred to but not shown and which communicates with the generator and is actuated by the steam pressure therein.

For a full and complete description of the operation of the apparatus as a whole, reference may be made to the above mentioned application whereof the present case is a division, and as disclosed in said application, the products that pass through both the main and auxiliary combustion chambers 3 and 4 are brought together beyond said chambers and are directed into the firebox of the furnace in connection with which the apparatus is used.

Having thus described our invention, what we claim is:

1. In combination, a steam generator comprising a relatively shallow vessel incorporating a top wall that slants downwardly from its opposite sides toward its longitudinal center, steam domes rising from the 0pposite sides of the top wall, and a combus tion device arranged to project its products across said top wall between the steam domes.

2. In combination,a steam generator comprising a relatively shallow vessel incorporating a top wall and steam domes rising from opposite sides of the top wall, heat con= ducting members depending from the top wall between the steam domes and arranged to extend into the water contained in the generator, and a combustion device arranged to project its products across said top wall between the steam domes.

In testimony whereof, we hereunto aflix our signatures.

LEE S. CHADWIOK. MARC RESEK. 

